exhaust cat pipe

biggeoff · Jan 27, 2018

I purchased a cat link pipe for my mk2 commando from good old ebay I drilled out the cat on each pipe and used a chisel which opened it up i inserted a flexi tube down the right hand pipe and it came out the left pipe and vice versa so these pipes do cross over

Fast Eddie · Jan 27, 2018

FWIW, The factory supplied de cat pipes do not cross over.

BritTwit · Jan 27, 2018

Fast Eddie said:
FWIW, The factory supplied de cat pipes do not cross over.

Interesting.
That would have to effect the bike's midrange power delivery and torque curve.

Fast Eddie · Jan 27, 2018

This is a picture of one that was posted on here previously. Can’t remember who though!

BritTwit · Jan 27, 2018

I wonder if the switch was made to non-crossover simply because the exhausts are made inhouse now, and non-crossover is simpler (less expensive) to build?

Fast Eddie · Jan 27, 2018

I don’t know. But linking them in a simple way wouldn’t be difficult, so personally I doubt it was just cost related.

They probably did it just for fun, to cause debates for years to come ala 850 crossover pipe vs none crossover...!

BritTwit · Jan 27, 2018

The one thing that might be easier without the crossover is removing the crankcase drain plug.
Looks like the separation between the pipes on the your non-crossover is greater that on the crossover version.
So this should make it easier to remove the drain plug.
Plug removal with the crossover pipes is a real bitch, and usually turns into a sloppy mess.

richard-7 · Jan 28, 2018

Fast Eddie said:
This is a picture of one that was posted on here previously. Can’t remember who though!

View attachment 3763

I have this pipe too. I plan on installing this spring. I’ll report back on this.

italia · Jan 28, 2018

Fast Eddie said:
This is a picture of one that was posted on here previously. Can’t remember who though!

That was my picture. I like the non-crossover aspect. True dual exhaust.

gchoppin · Jan 30, 2018

I guess I have the Norton decat pipe. Bought it from AF1 Racing in Austin TX. Christmas present from my wife. No crossover. Going on Sunday. I'm going to try to drill out the OEM Norton baffels as I have with many Harley slipons. We'll see. Then to AF1 for reflash. Drove 900 miles round trip to buy the bike. 600 miles to AF1 for a SC ECU Reflash. You gotta love these machines to do this shit. Count me in.

Fast Eddie · Jan 30, 2018

A lot of folk have posted on here that the different maps react rather differently to the different pipes. Even though the different pipes are all straight through, they seem to effect the mapping fpdifferently.

What I’m wondering here, is, is it wise to go down the baffle drilling route? Will you put yourself in unknown mapping territory and struggle to get it right?

exhaust cat pipe

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